Part A
ADS7807U
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 7038 PCS
- Package
- SOIC-28
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7807U and ADS7800KU/1K are both 12-bit successive-approximation ADCs offering comparable resolution and conversion performance, making the ADS7807U a viable functional candidate for the ADS7800KU/1K in many designs. However, differences in package footprint, analog input range configuration, and interface timing require careful validation against the target board and system requirements before committing to a drop-in substitution.
Resolution
High match
Package Type
Validation required
Analog Input Range
Validation required
Interface Timing
Validation required
Parts at a glance
Part B
ADS7800KU/1K
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 780 PCS
- Package
- SOIC-24
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS7807U | ADS7800KU/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 16-bit device offers far finer quantization than a 12-bit device. |
| Sampling Rate | 40 kSPS | 333 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the ADS7800 supports much faster sampling than the ADS7807. |
| Input Type | Single-ended | Single-ended | Input configuration affects how the analog source must be connected and whether differential signals can be measured directly. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the system rail; both parts operate from a single 5 V supply, simplifying power design. |
| Interface | Parallel | Parallel | The digital interface determines how the ADC connects to a host processor or FPGA; both use a parallel bus. |
| Package | 28-SOIC | 24-SOIC | Package footprint and pin count affect PCB layout and whether the parts are drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the device can reliably operate. |
| Integral Nonlinearity (INL) | ±2 LSB | ±0.5 LSB | INL describes deviation from an ideal transfer function and directly impacts measurement accuracy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7800KU/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 333k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | Internal |
| Voltage - Supply, Analog | 5V | 5V, -11.4V ~ 16.5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7807U and the ADS7800KU/1K?
The ADS7807U is a 16-bit successive-approximation ADC with a parallel interface, while the ADS7800KU/1K is a 12-bit successive-approximation ADC with a parallel interface. The ADS7807U offers higher resolution (16-bit vs 12-bit) and is specified for a different package and speed grade. The ADS7800KU/1K is a 12-bit device in a 24-pin package, whereas the ADS7807U is a 16-bit device in a 28-pin SOIC package. Designers must verify pinout, package, and timing compatibility before considering substitution.
Are the ADS7807U and ADS7800KU/1K pin-compatible?
No. The ADS7807U is supplied in a 28-pin SOIC package, while the ADS7800KU/1K is supplied in a 24-pin package. The pin counts and pin functions differ, so they are not drop-in replacements and require different PCB footprints.
What is the resolution and sampling rate of each device?
The ADS7807U is a 16-bit ADC with a maximum sampling rate of 40 kSPS. The ADS7800KU/1K is a 12-bit ADC with a maximum sampling rate of 333 kSPS. The ADS7800KU/1K therefore offers higher throughput at lower resolution, while the ADS7807U provides higher resolution at a lower sampling rate.
Do both devices support the same analog input range?
Both devices support bipolar analog input ranges. The ADS7807U offers software-selectable input ranges of ±10 V, ±5 V, 0 V to 10 V, and 0 V to 5 V. The ADS7800KU/1K supports a ±10 V bipolar input range. The input range configuration differs, so the analog front-end must be designed accordingly.
What are the supply voltage requirements for each part?
The ADS7807U operates from a single +5 V supply for the analog and digital sections, with an internal reference. The ADS7800KU/1K requires +5 V and −15 V supplies (dual supply) for operation. The differing supply requirements mean the power architecture must be reviewed before substitution.
What digital interface do these ADCs provide?
Both devices provide a parallel digital output interface. The ADS7807U outputs 16-bit parallel data, while the ADS7800KU/1K outputs 12-bit parallel data. The bus width and timing parameters differ, so the host interface and read timing must be validated against the respective datasheets.
Can the ADS7800KU/1K be used as a direct replacement for the ADS7807U in an existing design?
No. The two devices differ in resolution (12-bit vs 16-bit), package pin count (24-pin vs 28-pin), supply requirements (dual vs single +5 V), and sampling rate. A direct replacement is not possible without redesigning the PCB footprint, power supply, and digital interface.